Appearance potential spectroscopy studies with Fe/Ni alloys

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Abstract
Soft X-ray appearance potential spectra were recorded for a series of Fe/Ni alloys whose compositions in the surface region were determined by means of Auger electron spectroscopy. The L3 appearance potentials (correlated with the binding energies of 2p3/2 electrons) of Ni increase by 0.5 eV between 0 and 30% Fe and then at even higher Fe concentrations remain constant. The corresponding values for Fe are practically unaffected by alloying. This effect is tentatively ascribed to a local intra-atomic reorganization process of the Ni valence electrons. A quantity derived from the intensities of the APS peaks which is correlated with the (local) densities of unfilled states above EF varies linearly with the alloy composition.

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